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One of the functions of a motherboard BIOS, or UEFI, is the ability to discern which CPU is installed in the socket. With each new generation of CPUs, new versions of BIOS firmware are launched such that the new processors can be detected and run. It is impossible to know in advance which CPUs are coming out 12-24 months in the future, so users need to update their BIOS before updating CPUs.
Users who have invested in AMD’s AM4 platform, pairing a Ryzen-2000 series CPU or APU with an early revision of the A320/B350/X370 motherboards might already be too familiar with this: buying a motherboard which should support the CPU on the latest BIOS, but the retailer has older stock which has not been updated...